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Cash, cash equivalents and restricted cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash and cash equivalents $ 139,881 $ 177,993    
Long-term restricted cash 6,653 6,909    
Total cash, cash equivalents and restricted cash 146,534 $ 184,902 $ 140,880 $ 77,655
Letter of credit related to workers' compensation insurance 700      
Deposit related to customs activity 100      
Sale leaseback obligation        
Letter of credit associated with security deposit for leaseback transaction 5,900      
Revolving credit facility        
Restricted cash which relates to support of outstanding letters of credit 6,700      
Revolving credit facility | Sale leaseback obligation        
Letter of credit associated with security deposit for leaseback transaction $ 5,900